Staff and jewel mounting for watches



April 2, 1929. L, p. SIGLER 1,707,542

STAFF AND JEWEL MOUNTING FOR WATCHES Filed May 51, 1927 Patented Apr. 2,1929.

i UNlTED STA'l'S LOUG-I SIGLER, OF DLLAS, TEXAS.

STAFF AND JEWEL MGUNTING FR lVATCI-IES.

Apgcation filed May 31,

This invention relates to new and useful impro 'emen'ts in statt andjewel mountings for watches.

The object of the invention is to provide a mounting' for the balancestall et a watch which will be yieldable so that the jewels forming thebearings will not be cracked or broken from sudden shocks or are.

A iurthcr object of the invention is to provide a mounting t'or each endet the balance stall' comprising bearing members arranged to undergo,relatively oil the balance sta-tl, both a longitudinal and a 'transverseor lateral movement, thus yielding` in all directions.

ll. still turther object oi' the invention is te provide a mounting foreach end or a balance stall including a pair et jewels, each mounted inindi 'idual members andv said members being so arranged as to undergolongitudinal and lateral movements under the influence oi single springelement, thus obviating the necessity of providing a springl element foreach individual jewel niounting member'.

Another object oi the invention is to pro-- vide a jewel n'iountin,comprising; a pair oi resiliently sustained inter-meshing` jewelmounting members so arranged as to maintain their intermeshed relationand positive contact while undergoing the various movements.

A construction designed to carry out the invention will be hereinafterdescribed, together with other features of the invention.

The invention will be more readily understood from a reading` oi' the'following speci- `iication and by reference to the accompanyingdrawings7 in which an example of the invention is shown and wherein:

Fig. l is a vertical sectional view oi a portion of a watch movementshowing` the bal ance statt' and jewel mountings constructed inaccordance with my invention,

Fig. 2 is a plan view ot one el the mountings,

l? 3 is an underside View olf the cap jewel mounting member,

Fig'. 4lis a plan view oi the mounting meniber tor the perforated ewel7and Fig. 5 is a sectional detail slmwing,l portions et the mounting;members in displaced relation.

ln the drawings, which are, oi necessity, shown upon a greatly enlargedscale, the numeral l designates the lower plate of the 1927. Serial llo.195,325.

watch movement and ll the upper bracket vito' supporting` the upper endet the balance stail i2, the plate and bracket being provided withcircular recesses 13 for the reception oi the jewel bones ll in whichthe mounting members are'coniined.

As the mechanism in each jewel box is substantially the same adescription oi one-will suiiice 'lier both, and the bei; which isinserted in the recess i3 of the bracket ll will be used.V The box has acylindrical body with one end open and the other end closed by acircular plate l overhanging` the body and provided with a central oraxial opening` 1G. V'lhe opening 'lo is considerably larger in diameterthan the pivot 17 et the stall' l2. The plate l5 has a collar 18surroudingl the opening li and the staff l2 has a shoulder l)over-banning the pivot i7. dhis shoulder is adapted to the collar andlimit the longitudinal thrust et the stati. y

lllithin the bei; is arranged an annular jewel-mounting member 2O in thecenter ot whicl'i the usual perforated jewel 22 is suitably seeured. ilsecond annular je vel-mount ing member 23 is also disposed in the bei;in contact with the member O and has mounted therein the usual cap jewel2li. rlhe pivot 17 has a reduced spindle 25 extending through theperforated jewel 22 and bearing agains' the ewel Q/i in the usualmanner.

A spring tension member or disk 2G is i" stoned on the bracket ll by apair ot screws 2'2" and is provided with a central opening 28. Springlingers 2l) are bent down ifi-ous the disk on diametrieally opjviositesid s so as to bear on topot the cap member 23 on each side oi itscentral opening. lhe bei; may be cut away at ll to permit the lingers toireely fieri. The disk is cut out around these lingers so as to permitsaid lingers to readily yield. t will be noted that the cap member litscomparatively snug within the box lil, but has the major portion ot itsperiphery bevelled so as to reduce 'lrictional contact with'the circularwall of the box. By reason ot the spring lingers 2li) the cap member maymove longitudinally et the boia when displaced by a longitudinaline-vement oit the stall7 thus yielding te an end thrust when said capmember not designed `to undergo lateral jdisplacement.

@ne of the very important features oi the invention is the intermeshingrelation between tlie jewel-mounting members 23. The member 2O issomewhat less in diameter than the member 23 so as to be free to undergoa lateral movement. The member 20 has a V-shaped groove 30 and themember 23 has a V-sbaped annular' bead or bess 81 conforming to andlitting into said groove so that the adjacent surfaces of the mountingmembers may cont-act if' desired. The lingers 2D hold the member 23 incontact with the member 2() and the latter in contact with the innerside of the plate 14, whereby both members are resiliently sustained, bya single spring device or element.

It Will be apparent that a side thrust of tbe member 20 will cause theinclined Walls ot the groove 30 to ride along the inclined walls oic theboss 31, thus displacing the member 23 longitudinally with relation tothe statt' 12 and the member 2O laterally with relation tothe stati, asis indicated in Fig. 5. Such a movement of the two members permits thebalance stati' to move longitudinally at the same time it. is moving`laterally and its movement thus becomes universal, whereby any thrust isresiliently taken up and the staif is cushioned the result oi a suddenshock or jar, thereby being saved `from rupture, injury or breaking.

The single spring element and the intermeshing engagement o1nA themounting members is practical and simple and reduces to a minimum thenumber of parts employed, as well as making for substantiability andeasy assembly. The other bonr 14 which is inserted in the recess 13 of'the plate 10 has the same thrust absorbing members, but the collar 18is omitted 'from the plate 15 and the plate 15 is not countersunk, as isthe c se where it is mounted in the bracket 11. HOW ever, the plate 15of the other boX forms a bumper for the small roller 32 which on thestati' 12 and thus limits the end thrust of the stall?. It will be seenthat the boxes 14 and the springdisks 2G can be readily applied to theplate and bracket of a Watch movement Withoutan expensive operation andmay be easily removed when necessary.

The jewel member 20 may be referred to as the inner jewel-mountingmember, While the member 23 may be referred tor as the capjewel-mounting member.

Various changes in the size and shape ot the dili'erent parts, as wellas moditieatimis and alterations, may be made Within the scope of theappended claims.

lhat l claim, is:

1. ln a pivot bearing device :for a watch balance stati), an innerjewel-mounting member mounted to bodily move laterally, a capjewel-mounting member intermeshing with the adjacent face o'f the innermember and normally holding the inner member in position and againstlateral movementrelatively thereoi, and resilient means acting axiallyoi the staii:l 'ter enga the cap je 7elmounting with the inner mountingand constituing the sole resilient sustaining means for both member 2.In a pivot bearing device ler a watch balance stati?, a jewel box havinga central opening for receiving a balance stall and a bumper surroundingsaid opening lor limitingl the end 'thrust et the balance stall, aninner enel-mounting member carrying a perforated jewel and disposedwithin said boi; 'i'or lateral movement, a cap jewel-mounting membercarrying a cap jewel and mounted in said bei; for longitudinal movementand restrained against lateral movement, the cap jewel member havingsliding iiitcrmeslziim' engagement with the inner member whereby theouter member is displaced longitudinalljv by a lateral movement of theinner member, and a spring member acting axially oi the stati Yforengaging the cap member for yieldably sustaining both of the jewelmountiiig membe s in Contact.

3. In a pivot bearing device for a Watch balance stall?, an innerjewel-mounting mem ber having a perforated jewel and provided with ail-shaped groove, a cap jewel-mounting member provided with a cap jeweland having a tf-shaped boss engaging in the groove ot' the inner member,and i. spring disk having lingers tensioning the cap member intointerloeked engagement with the inner membe Il. ln a pivot bearingdevice tor a watch balance st an irmer jew ill-mounting member mountedfor 'lree lateral movement, a cap jcwel-mminting member intermeshingwith the inner member and retaii'ied against lateral movement butmovable upon the inner member longitudinally oit the stall". and meansfor yi eldingly retaining the cap member in conlact with the innermember to elect opposite movements o'l" said members by pressure tansmittcd from one to the other In testimony whereof I aliix mysignature.

LOUGH l). SIGLE?.

